Device for controlling a deinked cellulose production plant...

D - Textiles – Paper – 21 – C

Patent

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Details

D21C 5/02 (2006.01) D21G 9/00 (2006.01)

Patent

CA 2171851

Apparatus for the operation of a plant for producing deinked pulp with state analysers constructed in the form of neural networks for the waste paper suspension. At least one measuring device (ME) records spectral and/or physical characteristic values (IMf, Mp) of a waste paper suspension (PS). Furthermore, there are closed-loop or open-loop control devices (RS1...RS8) for operating means of a waste paper preparation (AAA) in the plant. According to the invention, there is at least one state analyser (ZA), configured in the form of a neural network (NNg) or a plurality of parallel neural networks (NN1...NN4), for the waste paper suspension (PS). This analyser forms from the characteristic values (IMf, Mp) controlled variables (ST: AB, AZ, FL, AA, AS, AT) for process control of the closed-loop or open-loop control devices (RS1...RS8) of operating means at least of the waste paper preparation (AAA). As controlled variables, the ratio of white to coloured papers (AB), the ratio of illustrated-magazine paper to newsprint paper (AZ), the average fibre length (FL), the ash content (AA), the content of dirt (AS) and/or the content of adhesive contaminants (AT) in the waste paper suspension (PS) are suitable with preference.

Au moins un dispositif de mesure (ME) saisit des valeurs caractéristiques spectrales et/ou physiques (Imf, Mp) d'une suspension de vieux papiers (PS). L'installation comprend en outre des agencements de régulation ou de commande (RS1...RS8) d'éléments d'exploitation de l'installation de traitement des vieux papiers (AAA). Au moins un analyseur (ZA) de l'état de la suspension de vieux papiers (PS) est constitué d'un (NNG) ou de plusieurs réseaux neuraux parallèles (NN1...NN4). Cet analyseur (ZA) dérive des valeurs caractéristiques (Imf, Mp) des valeurs d'influence (ST:AB, AZ, FL, AA, AS, AT) du fonctionnement des agencements de régulation ou de commande (RS1...RS8) des éléments d'exploitation d'au moins l'installation de traitement des vieux papiers (AAA). Le rapport entre les papiers blancs et colorés (AB), le rapport entre le papier journal et le papier de revues illustrées (AZ), la longueur moyenne des fibres (FL), la part en cendres (AA), la part en salissures (AS) et/ou la part en impuretés collantes (AT) dans la suspensiion de vieux papiers (PS) sont particulièrement utiles comme valeurs d'influence.

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